Enhanced two-photon absorption of CdS nanocrystal rods

被引:49
作者
Li, Xiangping [1 ]
van Embden, Joel [1 ]
Chon, James W. M. [1 ]
Gu, Min [1 ]
机构
[1] Swinburne Univ Technol, Ctr Microphoton, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia
基金
澳大利亚研究理事会;
关键词
cadmium compounds; fluorescence; II-VI semiconductors; nanostructured materials; nanotechnology; two-photon spectra; wide band gap semiconductors; EXCITATION CROSS-SECTIONS; QUANTUM RODS; SEMICONDUCTOR NANOCRYSTALS; OPTICAL NONLINEARITIES; CDTE; ULTRAFAST; PROBES;
D O I
10.1063/1.3100196
中图分类号
O59 [应用物理学];
学科分类号
摘要
In this letter we report that CdS nanocrystals are reshaped into an elongated rod form for increasing two-photon absorption. CdS quantum rods with uniform rod dimensions have been synthesized and their two-photon absorption cross section in solution has been characterized using the z-scan method and the two-photon induced fluorescence study. The absorption cross section was found to be 20.9x10(-46) cm(4)/s photon(-1) under two-photon excitation at wavelength 800 nm, which is an order of magnitude larger than that of CdS quantum dots of similar diameters. The higher two-photon absorption coefficient establishes the potential of this class of quantum rods for various photonic applications.
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页数:3
相关论文
共 24 条
[1]   Design of organic molecules with large two-photon absorption cross sections [J].
Albota, M ;
Beljonne, D ;
Brédas, JL ;
Ehrlich, JE ;
Fu, JY ;
Heikal, AA ;
Hess, SE ;
Kogej, T ;
Levin, MD ;
Marder, SR ;
McCord-Maughon, D ;
Perry, JW ;
Röckel, H ;
Rumi, M ;
Subramaniam, C ;
Webb, WW ;
Wu, XL ;
Xu, C .
SCIENCE, 1998, 281 (5383) :1653-1656
[2]   Two-photon fluorescence excitation cross sections of biomolecular probes from 690 to 960 nm [J].
Albota, MA ;
Xu, C ;
Webb, WW .
APPLIED OPTICS, 1998, 37 (31) :7352-7356
[3]   Semiconductor clusters, nanocrystals, and quantum dots [J].
Alivisatos, AP .
SCIENCE, 1996, 271 (5251) :933-937
[4]   Single-molecule spectroscopy with 27 fs pulses: Time-resolved experiments and direct imaging of orientational distributions [J].
Bopp, MA ;
Jia, Y ;
Haran, G ;
Morlino, EA ;
Hochstrasser, RM .
APPLIED PHYSICS LETTERS, 1998, 73 (01) :7-9
[5]   Two-photon-induced photoenhancement of densely packed CdSe/ZnSe/ZnS nanocrystal solids and its application to multilayer optical data storage [J].
Chon, JWM ;
Zijlstra, P ;
Gu, M ;
van Embden, J ;
Mulvaney, P .
APPLIED PHYSICS LETTERS, 2004, 85 (23) :5514-5516
[6]   Three-photon excited band edge and trap emission of CdS semiconductor nanocrystals [J].
Chon, JWM ;
Gu, M ;
Bullen, C ;
Mulvaney, P .
APPLIED PHYSICS LETTERS, 2004, 84 (22) :4472-4474
[7]   Use of two-photon excitation for erasable-rewritable three-dimensional bit optical data storage in a photorefractive polymer [J].
Day, D ;
Gu, M .
OPTICS LETTERS, 1999, 24 (14) :948-950
[8]  
Gu M., 1996, PRINCIPLES 3 DIMENSI, DOI [10.1142/3014, DOI 10.1142/3014]
[9]   Three-photon absorption in ZnO and ZnS crystals [J].
He, J ;
Qu, YL ;
Li, HP ;
Mi, J ;
Ji, W .
OPTICS EXPRESS, 2005, 13 (23) :9235-9247
[10]   Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film [J].
He, J ;
Ji, W ;
Ma, GH ;
Tang, SH ;
Kong, ESW ;
Chow, SY ;
Zhang, XH ;
Hua, ZL ;
Shi, JL .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (10) :4373-4376